Network Site Reliability Engineer (SRE)

Us3 Ltd; Greater London; On-site; GBP 70,000 - GBP 90,000; Full time

Job summary

A leading technology company in the UK is seeking a battle-tested Network SRE to own critical network incidents and lead responses in a 24/7 environment. The ideal candidate will have over 10 years of experience in network engineering, focusing on routing, switching, and wireless networking. This role requires deep troubleshooting skills and the ability to work with multi-vendor environments to ensure reliability and operational efficiency.

Qualifications

• 10+ years of hands-on network engineering experience in production environments.
• Deep expertise in routing & switching and wireless networking.
• Experience leading major incidents and comfort working independently.

Responsibilities

• Own critical network incidents and lead the response.
• Troubleshoot complex issues across routing, switching, and wireless.
• Automate operations using Linux-based tooling and infrastructure-as-code.

Skills

Network engineering

Routing & switching

Wireless networking

Troubleshooting skills

Incident management

Job description

We are looking for a battle-tested Network SRE who has owned large-scale production networks and led critical incidents end-to-end.

If you’ve been the final escalation, understand how networks actually fail, and use automation to reduce operational pain

What You’ll Do:

• Own critical network incidents — lead response, stabilize service, drive root cause analysis, and prevent repeat failures
• Troubleshoot complex issues across routing, switching, firewalling, and wireless (overlay + underlay)
• Set technical direction for network operations and reliability
• Automate away toil using Linux-based tooling and infrastructure-as-code
• Operate in a 24/7 environment supporting global, business-critical infrastructure
• Work across a multi-vendor environment (Arista, Cisco, Palo Alto, F5, NetScaler, Mist, Aruba, InfiniBand, and more)

What We’re Looking For:

• 10+ years hands-on network engineering experience in production environments

Deep expertise in:

• Routing & switching
• Wireless networking
• Strong overlay / underlay troubleshooting skills
• Proven experience leading major incidents
• Comfortable working independently and mentoring others